I believe the answer is: Psychologist
Psychology is a discipline that aimed to study all aspects of mind and behavior (both conscious and unconscious)
Scientific methodology under this discipline is used to found out the pattern on how the majority people react/behave when they're placed under certain occurrences
Cologne, Strasbourg,Koblenz,Basel,Dusseldorf
A. This is because when you do it then thats the result so you can clearly see why its what it is when that happens
This is where the south and the north are divided, it is the border betweeen Pennsilvainya and Maryland
The answer is c I believe